Squashed 'plugin/floo/common/' changes from 9da7bd0..39819ce

39819ce Use a join_action instead of a hodge-podge of kwargs and implicit things.
5726dc5 Tired of pep8 and pyflakes complaining for these files. Fix them.
8edb4fb Don't show stomp prompt if we just created an empty directory to sync to.

git-subtree-dir: plugin/floo/common
git-subtree-split: 39819ce7e528795901c60d89e0a980635eb128e7
Merge commit '5a031ea12f221e308c2ed8680107558f66169259' into floorc_json
Start of Vim UI stuff. Totally not working.